This is said so often, ever so often. We've learnt it in high school - remember all those simple interest and compound interest rate formulas? It's amazing - the simplicity of the math. What does compounding mean? Why is it used so often in conjunction with wealth creation?Well, let's dive right into it. The amount that you are going to invest in your first year - say on 1st of January, that's the principal amount. Let's say you just received your year end bonus of 1 lakh; and you decide to place this entire sum in a Fixed Deposit (FD) in your regular bank; which gives you 6.5% interest per annum.
Let's see what happens to your money. Your money (1 lakh @ 6.5% per year) grows to 1 lakh and 6.5k in exactly one year. But the magic starts in the second year. Your new starting point is now 1,06,500 which @ 6.5% - becomes 1,13,423 by January 1, 2021 - i.e. after 2 years. In the table below, you can see how the money grows year on year (Y-O-Y).
But the beauty is understanding the importance of the rate of interest.
I have not considered the tax component that may get cut from your interest component - but we shall delve into this at a later point.
How do I know how much rate of interest my bank offers?
Every bank puts up these figures on its website. I have copied the HDFC FD rate below as an example. These get updated regularly based on several macro factors, RBI guidelines etc.